ASTM B626 Alloy C276 Welded Tube, Annealed | Longitudinal Seam

ASTM B626 Alloy C276 Welded Tube, Annealed | Longitudinal Seam

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies astm b626 alloy c276 welded tube, annealed | longitudinal seam for buyers whose primary search intent is welded chemical heat-exchanger and condenser tubing, not generic stainless or nickel-alloy stock. The page should be quoted against the selected standard edition, the equipment or component drawing and the governing design code. Longitudinally welded Alloy C276 tube to ASTM B626 for heat-exchanger, condenser and general corrosive or elevated-temperature service.

The material decision should start with service conditions. High-molybdenum Ni-Cr-Mo-W alloy chosen for severe chemical corrosion; weld quality and post-weld solution treatment are central purchasing controls. Compare with B622 seamless tube where the purchaser prohibits a seam; welded tube may offer size and cost advantages when the seam route is qualified. This comparison belongs in the enquiry stage because a higher alloy name does not automatically deliver the lowest life-cycle risk.

A complete RFQ needs product form, grade/UNS, ordered condition, dimensional basis, tolerances, quantity and inspection level. ASTM B626 covers a defined OD/wall scope; state OD, wall, length, weld-bead condition and any tighter exchanger tolerance. For pressure-containing products, the material standard controls product quality; it does not replace pressure-design calculations, corrosion allowance or code approval.

Manufacturing and documentation must remain connected. Automatic longitudinal welding without filler metal, followed by required cold work/solution treatment, sizing and inspection. The baseline verification plan is: MTC, weld-process traceability, hydrostatic or NDE, eddy current/UT when ordered, dimensional checks, PMI and optional corrosion tests. Any supplementary requirement—PMI extent, UT class, eddy-current acceptance, corrosion testing, grain size, roughness, cleanliness or third-party inspection—must appear in the PO before production.

Fabrication guidance: Tube-to-tubesheet welding still needs a qualified project WPS. Keep the automatic longitudinal seam separate from field closure weld requirements. Selection boundary: Do not market welded tube using seamless images or spiral seams. Publication requires real weld-route, heat-treatment, inspection and packaging evidence. Buyers should provide fluid composition, maximum and minimum temperature, pressure, design life, fabrication route and applicable code so the quotation can separate mandatory requirements from optional controls.

Standards, Dimensions and Supply Definition

Material and Selection Markers

Use note: Values above are concise identification/selection markers, not a replacement for the ordered ASTM/AWS chemistry table or the MTC.

Candidate Applications

• Acid coolers.
• Reactor condensers.
• Wet-scrubber heat recovery.
• Chemical-process evaporators.

Buyer Decision Boundary

Compare with B622 seamless tube where the purchaser prohibits a seam; welded tube may offer size and cost advantages when the seam route is qualified.

Processing, Inspection and Documentation

• Manufacturing: Automatic longitudinal welding without filler metal, followed by required cold work/solution treatment, sizing and inspection.
• Fabrication: Tube-to-tubesheet welding still needs a qualified project WPS. Keep the automatic longitudinal seam separate from field closure weld requirements.
• Inspection: MTC, weld-process traceability, hydrostatic or NDE, eddy current/UT when ordered, dimensional checks, PMI and optional corrosion tests.
• Traceability: Keep heat/lot identity through cutting, machining, bending, welding, testing and packing.
• Documentation: Confirm MTC type, test reports, packing list, country-of-origin statement and third-party inspection before production.

RFQ Checklist

• Standard and adopted edition: ASTM B626
• Grade / UNS: Alloy C276 / N10276
• Form and route: Longitudinally welded tube
• Dimensions, tolerances, quantity and unit basis
• Delivery/heat-treatment condition and surface/end finish
• Design code, service fluid/atmosphere, pressure and temperature
• Inspection/NDE, acceptance criteria, MTC and third-party witness points
• Marking, preservation, packing and delivery destination

Inquiry CTA

Frequently Asked Questions

1. What does ASTM B626 cover for this product? Longitudinally welded Alloy C276 tube to ASTM B626 for heat-exchanger, condenser and general corrosive or elevated-temperature service. Always purchase to the edition adopted by the contract or project specification.
2. Is this product seamless, welded, forged, rolled or drawn? The PO must state the required route exactly: Longitudinally welded tube. Do not rely on a product photograph or a family name to establish the route.
3. How should buyers select Alloy C276? High-molybdenum Ni-Cr-Mo-W alloy chosen for severe chemical corrosion; weld quality and post-weld solution treatment are central purchasing controls. Compare with B622 seamless tube where the purchaser prohibits a seam; welded tube may offer size and cost advantages when the seam route is qualified.
4. Which dimensions must be included in the RFQ? ASTM B626 covers a defined OD/wall scope; state OD, wall, length, weld-bead condition and any tighter exchanger tolerance. Add quantity, unit basis, tolerances and any drawing-controlled geometry.
5. What heat-treatment or delivery condition is required? Solution annealed and descaled after automatic welding as required by the ordered specification. The MTC and heat-treatment records should use the same grade and condition language as the PO.
6. Which inspection documents can be requested? MTC, weld-process traceability, hydrostatic or NDE, eddy current/UT when ordered, dimensional checks, PMI and optional corrosion tests. The final inspection scope must be agreed before order placement.
7. Is it suitable for the intended corrosive or high-temperature service? Do not market welded tube using seamless images or spiral seams. Publication requires real weld-route, heat-treatment, inspection and packaging evidence. A material engineer should approve the final choice using actual service data.
8. What fabrication issues should be addressed? Tube-to-tubesheet welding still needs a qualified project WPS. Keep the automatic longitudinal seam separate from field closure weld requirements. Use a qualified procedure and preserve heat/lot traceability after cutting or fabrication.
9. What are typical applications? Common candidate applications include acid coolers, reactor condensers, wet-scrubber heat recovery, chemical-process evaporators. These examples are not blanket design approvals.
10. What information is needed for a firm quotation? Send standard and edition, grade/UNS, form, dimensions, condition, quantity, delivery destination, inspection/NDE, documentation, packing and any third-party inspection or code requirement.